+ R+D on MSRs was successfully carried out at ORNL (by MSR Experiment), across the 1950's & 1960's

+ Builds require less & less-costly materials than what I call "Fuel Rod based dinosaurs"
+ both in the factory and in the building they'll be installed+running in sealled units
+ Safer to operate
+ MSRs fuels remain in Liquid state, ~air pressure (no risk of puncture causing issues)
+ Low Core pressure (near normal Air pressure)
+ No need for 1-piece, 9" thick, stainless-steel core envelope
+ No need for costly Fuel Rods (due to sole-source availability)
+ No need for complex, lengthy, costly shutdowns for refueling
+ MSRs due ~2024 will be sealed units, & run for ~7 years without refueling
+ Have much Lower Build-Costs
+ am MSR can be configured to extract energy from either "spend/used Fuel Rods" or
even atomic- or nuclear-bombs.
+ Produce much higher temperatures, suitable for more efficient Electricity generation
+ High-temp; output can first power a Water Desalination plant, then go on to generate Electricity in a 2nd plant, with slightly cooler water from the Water Desal'n plant
+ Smaller
+ have Cores that are Transportable
+ Can be built in Factory (like big jets), eg,by ThorCon Power (Fla,,US), eg, in Indonesia
+ are Walk-Away Safe (a.k.a. "intrinsically safe")
+ need No Operating/Contol Room
+ MSRs are impossible to configure in such a way to make it explode
+ Canada's Terrestrial Energy Inc are set to have their IMSR running by/before ~2025